Buggy code:
public synchronized IClasspathContainer containerGetDefaultToPreviousSession ( IJavaProject project , IPath containerPath ) { } private synchronized Map containerClone ( IJavaProject project ) { } private boolean containerIsInitializationInProgress ( IJavaProject project , IPath containerPath ) { } private void containerAddInitializationInProgress ( IJavaProject project , IPath containerPath ) { } public synchronized void containerPut ( IJavaProject project , IPath containerPath , IClasspathContainer container ) { } public synchronized void containerRemove ( IJavaProject project ) { } public boolean containerPutIfInitializingWithSameEntries ( IPath containerPath , IJavaProject [ ] projects , IClasspathContainer [ ] respectiveContainers ) { } private void verbose_missbehaving_container ( IPath containerPath , IJavaProject [ ] projects , IClasspathContainer [ ] respectiveContainers , final IClasspathContainer container , final IClasspathEntry [ ] newEntries , final IClasspathEntry [ ] oldEntries ) { } void verbose_missbehaving_container ( IJavaProject project , IPath containerPath , IClasspathEntry [ ] classpathEntries ) { } void verbose_missbehaving_container_null_entries ( IJavaProject project , IPath containerPath ) { } private void containerRemoveInitializationInProgress ( IJavaProject project , IPath containerPath ) { } private synchronized void containersReset ( String [ ] containerIDs ) { } public static IJavaElement create ( IResource resource , IJavaProject project ) { } public static IJavaElement create ( IFile file , IJavaProject project ) { } public static IJavaElement create ( IFolder folder , IJavaProject project ) { } public static IClassFile createClassFileFrom ( IFile file , IJavaProject project ) { } public static ICompilationUnit createCompilationUnitFrom ( IFile file , IJavaProject project ) { } public static IPackageFragmentRoot createJarPackageFragmentRootFrom ( IFile file , IJavaProject project ) { } public static IJavaElement determineIfOnClasspath ( IResource resource , IJavaProject project ) { } private static JavaModelManager MANAGER = new JavaModelManager ( ) ; private JavaModelCache cache ; private ThreadLocal temporaryCache = new ThreadLocal ( ) ; protected HashSet elementsOutOfSynchWithBuffers = new HashSet ( 11 ) ; public DeltaProcessingState deltaState = new DeltaProcessingState ( ) ; public IndexManager indexManager = null ; protected Map perProjectInfos = new HashMap ( 5 ) ; protected Map perWorkingCopyInfos = new HashMap ( 5 ) ; protected WeakHashMap searchScopes = new WeakHashMap ( ) ; public static class PerProjectInfo { private static final int JAVADOC_CACHE_INITIAL_SIZE = 10 ; static final IJavaModelStatus NEED_RESOLUTION = new JavaModelStatus ( ) ; public IProject project ; public Object savedState ; public boolean triedRead ; public IClasspathEntry [ ] rawClasspath ; public IJavaModelStatus rawClasspathStatus ; public int rawTimeStamp = 0 ; public boolean writtingRawClasspath = false ; public IClasspathEntry [ ] resolvedClasspath ; public IJavaModelStatus unresolvedEntryStatus ; public Map rootPathToRawEntries ; public Map rootPathToResolvedEntries ; public IPath outputLocation ; public IEclipsePreferences preferences ; public Hashtable options ; public Hashtable secondaryTypes ; public LRUCache javadocCache ; public PerProjectInfo ( IProject project ) { } public synchronized IClasspathEntry [ ] getResolvedClasspath ( ) { } public void rememberExternalLibTimestamps ( ) { } public synchronized ClasspathChange resetResolvedClasspath ( ) { } private ClasspathChange setClasspath ( IClasspathEntry [ ] newRawClasspath , IPath newOutputLocation , IJavaModelStatus newRawClasspathStatus , IClasspathEntry [ ] newResolvedClasspath , Map newRootPathToRawEntries , Map newRootPathToResolvedEntries , IJavaModelStatus newUnresolvedEntryStatus ) { } public synchronized ClasspathChange setRawClasspath ( IClasspathEntry [ ] newRawClasspath , IPath newOutputLocation , IJavaModelStatus newRawClasspathStatus ) { } public synchronized ClasspathChange setResolvedClasspath ( IClasspathEntry [ ] newResolvedClasspath , Map newRootPathToRawEntries , Map newRootPathToResolvedEntries , IJavaModelStatus newUnresolvedEntryStatus , int timeStamp ) { } public synchronized IClasspathEntry [ ] readAndCacheClasspath ( JavaProject javaProject ) { IClasspathEntry [ ] classpath ; IJavaModelStatus status ; try { classpath = javaProject . readFileEntriesWithException ( null ) ; status = JavaModelStatus . VERIFIED_OK ; } catch ( CoreException e ) { classpath = JavaProject . INVALID_CLASSPATH ; status = new JavaModelStatus ( IJavaModelStatusConstants . INVALID_CLASSPATH_FILE_FORMAT , Messages . bind ( Messages . classpath_cannotReadClasspathFile , javaProject . getElementName ( ) ) ) ; } catch ( IOException e ) { classpath = JavaProject . INVALID_CLASSPATH ; if ( Messages . file_badFormat . equals ( e . getMessage ( ) ) ) status = new JavaModelStatus ( IJavaModelStatusConstants . INVALID_CLASSPATH_FILE_FORMAT , Messages . bind ( Messages . classpath_xmlFormatError , javaProject . getElementName ( ) , Messages . file_badFormat ) ) ; else status = new JavaModelStatus ( IJavaModelStatusConstants . INVALID_CLASSPATH_FILE_FORMAT , Messages . bind ( Messages . classpath_cannotReadClasspathFile , javaProject . getElementName ( ) ) ) ; <START_BUG> } catch ( AssertionFailedException e ) { <END_BUG> classpath = JavaProject . INVALID_CLASSPATH ; status = new JavaModelStatus ( IJavaModelStatusConstants . INVALID_CLASSPATH_FILE_FORMAT , Messages . bind ( Messages . classpath_illegalEntryInClasspathFile , new String [ ] { javaProject . getElementName ( ) , e . getMessage ( ) } ) ) ; } IPath output = null ; if ( ( classpath . length ) > 0 ) { IClasspathEntry entry = classpath [ ( ( classpath . length ) - 1 ) ] ; if ( ( entry . getContentKind ( ) ) == ( ClasspathEntry . K_OUTPUT ) ) { output = entry . getPath ( ) ; IClasspathEntry [ ] copy = new IClasspathEntry [ ( classpath . length ) - 1 ] ; System . arraycopy ( classpath , 0 , copy , 0 , copy . length ) ; classpath = copy ; } } setRawClasspath ( classpath , output , status ) ; return classpath ; } public String toString ( ) { } public boolean writeAndCacheClasspath ( final JavaProject javaProject , final IClasspathEntry [ ] newRawClasspath , final IPath newOutputLocation ) throws JavaModelException { } } public static class PerWorkingCopyInfo implements IProblemRequestor { int useCount = 0 ; IProblemRequestor problemRequestor ; CompilationUnit workingCopy ; public PerWorkingCopyInfo ( CompilationUnit workingCopy , IProblemRequestor problemRequestor ) { } public void acceptProblem ( IProblem problem ) { } public void beginReporting ( ) { } public void endReporting ( ) { } public IProblemRequestor getProblemRequestor ( ) { } public ICompilationUnit getWorkingCopy ( ) { } public boolean isActive ( ) { } public String toString ( ) { } } public static boolean VERBOSE = false ; public static boolean CP_RESOLVE_VERBOSE = false ;

Fix:
} catch ( ClasspathEntry . AssertionFailedException e ) {